If the average of 10, k and 30 is 21. What is the value of k?
If the average of 10, k and 30 is 21. What is the value of k?
Explanation
Given the average of 10, k, and 30 is 21:
(10 + k + 30) / 3 = 21
Multiply both sides by 3:
10 + k + 30 = 63
Combine constants:
40 + k = 63
Subtract 40 from both sides:
k = 23